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  "body": "\n## Summary\n\nSometimes used as a synonym of $(\\square)$ for avoiding nested parentheses.\n\n[[Equivalence class|082RMRSY26]]: given an [[equivalence relation|0G8VEZ3WTK]], $[x]$ often denotes the equivalence class of the element $x$.\n\nIntegral part: if $x$ is a [[real number|08J2M1JYAG]], $[x]$ often denotes the integral part or truncation of $x$, that is, the integer obtained by removing all digits after the decimal mark. This notation has also been used for other variants of floor and ceiling functions.\n\nIverson bracket: if $P$ is a predicate, $[P]$ may denote the Iverson bracket, that is the [[function|0EPAT51DXQ]] that takes the value $1$ for the values of the free variables in $P$ for which $P$ is true, and takes the value $0$ otherwise. For example, $[x=y]$ is the Kronecker delta function, which equals one if $x=y$, and zero otherwise.\n\nIn combinatorics or computer science, sometimes $[n]$ with $n\\in\\mathbb{N}$ denotes the set $\\{1,2,3,\\ldots,n\\}$ of positive integers up to $n$, with $[0]=\\emptyset$.\n",
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